<html>
  <!--
		SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
		SPDX-License-Identifier: MIT
	-->
  <head>
    <title>ice-restart</title>
  </head>

  <body>
    <button onclick="window.doSignaling(true)"> ICE Restart </button><br />


    <h3> ICE Connection States </h3>
    <div id="iceConnectionStates"></div> <br />

    <h3> ICE Selected Pairs </h3>
    <div id="iceSelectedPairs"></div> <br />

    <h3> Inbound DataChannel Messages </h3>
    <div id="inboundDataChannelMessages"></div>
  </body>

  <script>
    let pc = new RTCPeerConnection({
      iceServers: [
        {
          urls: 'stun:stun.l.google.com:19302'
        }
      ]
    })
    let dc = pc.createDataChannel('data')

    dc.onopen = () => {
      setInterval(function() {
        let el = document.createElement('template')
        let selectedPair = pc.sctp.transport.iceTransport.getSelectedCandidatePair()

        el.innerHTML = `<div>
          <ul>
             <li> <i> Local</i> - ${selectedPair.local.candidate}</li>
             <li> <i> Remote</i> - ${selectedPair.remote.candidate} </li>
          </ul>
        </div>`

        document.getElementById('iceSelectedPairs').appendChild(el.content.firstChild);
      }, 3000);
    }

    dc.onmessage = event => {
      let el = document.createElement('p')
      el.appendChild(document.createTextNode(event.data))

      document.getElementById('inboundDataChannelMessages').appendChild(el);
    }

    pc.oniceconnectionstatechange = () => {
      let el = document.createElement('p')
      el.appendChild(document.createTextNode(pc.iceConnectionState))

      document.getElementById('iceConnectionStates').appendChild(el);
    }


    window.doSignaling = iceRestart => {
      pc.createOffer({iceRestart})
        .then(offer => {
          pc.setLocalDescription(offer)

          return fetch(`/doSignaling`, {
            method: 'post',
            headers: {
              'Accept': 'application/json, text/plain, */*',
              'Content-Type': 'application/json'
            },
            body: JSON.stringify(offer)
          })
        })
        .then(res => res.json())
        .then(res => pc.setRemoteDescription(res))
        .catch(alert)
    }

    window.doSignaling(false)
  </script>
</html>
